<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <Car
          v-for="(item, i) in goodList"
          :key="i"
          :obj="item"
          @del="delFn"
          :id="i"
        ></Car>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ totalPrice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import Car from "@/components/practise/Car";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    Car,
  },
  computed: {
    isAll: {
      get() {
        if (this.goodList.length === 0) {
          return;
        }
        return this.goodList.every((item) => item.checked);
      },
      set(val) {
        this.goodList.forEach((item) => (item.checked = val));
      },
    },
    totalPrice() {
      const res = this.goodList.filter((item) => item.checked);
      return res.reduce((prev, item) => prev + item.num * item.price, 0);
    },
  },
  methods: {
    delFn(id) {
      this.goodList = this.goodList.filter((item, i) => i !== id);
    },
  },
};
</script>

<style>
</style>